pnfs: add a nfs4_get_deviceid helper

This will be used by the block layout driver when splitting extents.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 3eeca49d9ca2..d84fe29fc88b 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -280,6 +280,13 @@ void nfs4_deviceid_purge_client(const struct nfs_client *);
 int nfs4_deviceid_getdevicelist(struct nfs_server *server,
                 const struct nfs_fh *fh);
 
+static inline struct nfs4_deviceid_node *
+nfs4_get_deviceid(struct nfs4_deviceid_node *d)
+{
+        atomic_inc(&d->ref);
+        return d;
+}
+
 static inline struct pnfs_layout_segment *
 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 {